how to update m3i zero for dsi

I am using an m3i zero in my dsi. I originally installed the touchpad and sakurta together and see that there have been updates since. Could someone please advise me do i need to delete the operating systems from my sd card before putting on the new one or does it just install over? Are there any other tricks or traps I should know of before updating my m3i zero card? Thankyou

You just have to copy the new System folder onto you sc card and it automaticlly overwrites the old files (I prefer touchpod).
;) ??? ;D ::) :P

thank you i'll give it a go.